other games they own the right to ?

Games they don't have any intention of making sequels to out of fear those games will interfere/cut into popularity/sales of their FF games. Or that staff that might be used to develope those games are devoted/required to make FF games and they don't have the time or resources for these other games.

I don't know if that is so. Just wondering.

That would include games like the Chrono games, Ogre battle that they own through Enix, Valkyrie profile games, and others.

Any comments ?

I am a FF fan btw so I want FF games to be developed.But I also want new sequels to the chrono games, Ogre battle and other rpgs as well.